Process for preparing barium hydkoxid from barium sulfid



EDWARD A. BARNES, OF SOUTH SAN FRANCISCO, CALIFORNIA.

PROCESS FOR PREPARING BARIUM HYDROXID FROM BARIUM SULFID.

No Drawing.

To all whom it may concern.-

Be it known that I, EDWARD A. BARNES, a subject of the King of England, residing at South San Francisco, in the county of San Mateo and State of California, have invented new and useful Improvements in Processes for Preparing Barium Hydroxid from Barium Sulfid, of which the following is a specification.

This invention relates to the preparation of barium hydroxid or barium hydrate, liatOl-D from barium sulfid, BaS, and its separation in a pure state in readiness for such further uses and combinations as may be desired.

It consists in subjecting a solution of barium sulfid to a reduction of temperature, whereby the barium hydroxid will be crys tallized out from the solution in a substan tially pure condition. y

In carrying out In process, I take a solution of barium sul d of from 8 to 10 Baum gravity, and a temperature of from 15 to 20 centigrade, and rapidly cool and agitate it until the temperature is reduced to between 0 and 5 centigrade. Under this condition almost pure crystals of barium hydroxid will be deposited and may be separated from the sulfid solution.

This product may be further purified by washing with a saturated solution of barium liydroxid of the same temperature, thus eliminating the last trace of the more soluble sulfhydrate. The purification may also 35,be effected by re-crystallization with or withi ever,

out the aid of cooling solutions. If, howsolutions of a strength above 10 Baum be employed, the barium hydrate will be contaminated with barium sulfid in proportion to increasing strength employed,

On the other hand if solutions of a strength below 8 Baum are used, too small a proportion of pure hydroxid is obtainable.

On drying the crystallized barium hydroxid in air which is free from carbonic acid, or in wow, the dehydrated barium hydroxid Ba(OH) is obtained in absolutely pure form and can be used ion the production of Specification of Letters Patent.

' ing the solution to cooled and then separating the crystals from rapid Patented Sept. 16, 1919.

' Application filed February 7, 1918. Serial No. 215,787.

absolutely pure barium peroxid (BaO by the usual methods.

By this process barium hydroxid can be produced much more economically than by the existing technical. methods.

Having thus described my invention, what A I claim and desire to secure by Letters Pat- 3. The process of manufacturing barium hydroxid which consists in subjecting a sulfid solution of barium having a temperature of from 15 to 20 C. to a rapid cooling actlon to crystallize the barium'hydroxid, then separating the crystals from the solution and drying the same under a partial vacuum.

1. The process of manufacturing barium hydroxid which consists in subjecting a sulfid solution of barium to a cooling action which rapidly reduces its temperature to approximately 5 C., thereby causing crystallization of the, barium hydroxid, subjectagitation while it is being the solution.

5. The process of producing barium hydroxid from. barium sulfid. consisting in subjecting a solution of barium sulfid of a strength of from 8 to 10 Baum and a temperature of from 15 to 20 centigrade to a agitation and a reduction of temperature to approximately between 0 and 5 centigi'ade'and crystallizing from the solution the barium hydroxid.

6. The process of producing barium hydroxid from a barium sulfid solution, consisting in subjecting a solution of barium sulfid of a strength of from 8 to 10 Baum, In testimony whereof I have hereunto set and a, temperature of from 15 to 20 cenmy hand in the presence of two subscribing 10 ti ade to a rapid agitation and a reduction witnesses. o temperature to approximately between 0 5 and 5 centigrade and crystallizing from y the solution the barium hydroxid, and finally Witnesses: drying the crystalline product in an atmos- BENJAMIN HENRY TRUAX, phere free from carbonic acid. DANIEL -MCSWEENEY.

EDWARD. A. BARNES. 

